Cabinet for exhibiting eye-testing devices.



No. 730,023. PATBNTED JUNE 2. 1903.

Y J. JOHNSTON. CABINET FOR EXHIBITING EYE TESTING DEVICES.

APLIOATION FILED BEPTf13, 1901.

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No.'730,023- PATENTED JUNE 2,1903

J. M. JOHNSTON. I

' CABINET FOE EXHIBITING EYE TESTING DEVICES.

AAAAAAAA IQN FILED SEPT. 13. 1901.

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UNiTED STATES I Patented June 2, 1903.

PATENT OFFICE.

JOHN MILTON JOHNSTON, OF CHICAGO, ILLINOIS. 1

, SPECIFICATION formingpart of Letters Patent N9. 730,023, dated J une. 2, 1903.

7 Application filed September 13, 1901. Serial No- 75,324. (No model.) I i To all whom it may concern:

Be it known that 1, JOHN MILTON JOHNSTON, a citizen of the United States, residing at .Ohicago, in the countyof Cook and State of Illinois, have invented certain new and useful Improvements in Cabinets for Exhibiting Eye-Testing Devices, of which the following is a specification.

My invention relates to improvements in cabinets for exhibiting eye -testing devices; and the main object of my invention is the provision of a single-cased device containing mechanisms for performing the different tests employed by occulists ,and Opticians, and thus dispense with a number of separate complicated devices, as is the present use.

To attain the desired objects, the invention consists of an eye-testing device embodying novel features of construction and combination of parts, substantially as disclosed herein.

In the drawings, Figure 1 is a front elevation of the device. Fig. 2 is a vertical central section thereof. Fig. 3 is a front elevation of the device with the front removed, and Fig. 4 is an enlarged detail view of one ofthe shafts carrying the astigmatic letters.

Referring by numeral to the drawings, the numeral 1 designates a casing, which maybe rectangular in form; but I prefer to make it in the form of a clock. Formed in the upper front of the casing is the long rectangular opening 2, through which are adapted to be observed letters or numbers or other charac ters carried upon the transparent band 3, passed behind this opening by means of the rollers 4 and 4*, which arev journaled in the bearings 5 in the sides of the casing. A light 6 is employed when needed to causethe letters to be plainly seen and may be in the casing or in any convenient position outside. To revolve the rollers, I employ the cord 7, which is secured to the drum or spool 8, fastened upon the end of the roller 4*. From this drum the cord passes downward around the pulley 9, to and around the spool or wheel 10, mounted upon supporting-bolt .11 of shaft 12, upon whose outer end 12 is rigidly secured the dial 13.

cut away, as shown in Fig. 2, to provide a space for the mounting of the spool or wheel 10, upon whose outer face is fastened the band or strip'14, which is bent inward to A portion of this shaft is form the two indicators 14 upon the outside of the dial. The cord 7 after circling the spool 10 passes out through the side of the casing and is provided with a button 15, which allows the same'tobe pulled upon to operate the transparent band and the dials indicators. The roller. 4, being provided with a spring-roller, such as a curtain-roller, allows the cord to be pulledinto the casing automatically and also allows the stopping of the indicators and band at any desired place.

Below the roller '4 and journaled in the bearings 16 on the inside ofthe casing'is the roller 17 whichcarries a shade or curtain 18, upon which is printed the prism-test 19, consisting of two series of dots, letters, and numerals, said dots and numerals being'printed in different colors. to be drawn forward and downward in front of the dial by means of the cords 20, which are connected to the roller 22. A grooved pulley-wheel 24 is employed to revolve the roller 22, and thus operate the curtain.

In the face of the casing, arranged in the form of corners of a square around the dial, are the four rectangular openings 25, through which are adapted to be observed the astigmatic letters 26, which are mounted upon the outer free ends of the. disks 27, carried by the shafts 28. These shafts 28 are made substantially in two parts, the disks being upon the This curtain is adapted short outer ends and the inner ends 29 being the longer portions. The disk is provided with the groove or channel :30 for the reception. of the operating-cord 31, asocket 32 and a set-screw 33 being carried by the outer end of the shaft 28, so as to connect the longer portion 29 securely to the lug or projection 34 thereof. To operate these shafts, I employ the cord 31, having at its respective ends the buttons37. The cord 31 is passed around shafts 28, being then passed through the side and provided with a button. When this but. ton is pulled upon, the shafts revolvesimuh taneously.

From this description, taken in connection I lCO testing-device cabinet which dispenses with the numerous and complicated instruments and devices used at present and produce one which embodies all the important mechanisms for performing these tests, and by this construction and arrangement I produce a very simple and inexpensive device.

lVhat I claim is An eye-testing device, comprising a base, a rear wall, side walls and a front wall mount ed upon said base, said rear wall and front wall being provided with four pairs of alined bearings, shafts mounted insaid bearings, two upper pairs of bearings and two lower pairs of bearings carried upon opposed sides of the side walls, a series of shafts mounted in said bearings, a continuous belt carried by the upper pair of shafts, a curtain carried by the lower pair of shafts and adapted to be moved up and down by rotating said shafts, a shaft 12 mounted in the rear of the casing, a circular disk carried upon the front end of said shaft, mechanism to revolve simultaneously said shaft 12 and the upper pair of shafts carryin g the belt, mechanism to revolve the four first-mentioned shafts, and disks carried upon the outer ends of the four first-mentioned shafts; said front wall of the casing being provided at its top with a rectangular opening adjacent to the continuous belt, a lower circular opening adjacent to the disk carried by shaft 12, and a series of rectangular openings adjacent to the disks carried by the firstmentioned shafts.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN MILTON JOHNSTON. \Vitnesses:

D. P. MATTHEws, WM. E. SPENCER. 

